The CSA240 device is a current-sense amplifier with enhanced PWM rejection that can sense drops

across shunt resistors over a wide common-mode

voltage range from –6V to 80V, independent of the

supply voltage. The enhanced PWM rejection

function suppresses large common-mode

transients (ΔV/Δt) in systems that use pulse width

modulation (PWM) signals, such as motor drives

and solenoid control systems. The negative

common-mode voltage allows the device to

operate below ground, accommodating the

flyback period of typical solenoid applications.

The features ensure the accurate current

measurements without large transients and

associated recovery ripple on the output voltage.

This device operates from a single 2.7V to 5.5V

power supply, drawing a typ of 1.4mA of supply

current. Four fixed gains are available: 20V/V,

50V/V and100V/V. The low offset of the zero-drift

architecture enables current sensing with

maximum drops across the shunt as low as 10mV

full-scale. All versions are specified over the

extended operating temperature range (–40°C to

125°C), and are offered in an 8-pin TSSOP, MSOP

and 8-pin SOIC packages. See Table 1 for the order

information.

　　1. FEATURES

• Enhanced PWM rejection

• Excellent CMRR:

160dB DC CMRR

105dB AC CMRR at 50kHz

• Wide common-mode range: –6V to 80V

• Accuracy:

Gain:

• Gain error: 0.25% (Typ)

• Gain drift: 6 ppm/°C (Typ)

Offset:

• Offset voltage: ±5μV (Typ)

• Offset drift: ±30nV/°C (Typ)

• Available gains:

CSA240L: 20V/V

CSA240M: 50V/V

CSA240N: 100V/V

• Quiescent current: 1.4mA (Typ)

2. APPLICATIONS

• Motor controls

• Solenoid and valve controls

• Power management

• Actuator controls

• Pressure regulators

• Telecom equipment